cloudformation.yml

AWSTemplateFormatVersion: "2010-09-09"
Description: "Deploys an API gateway you can use with VoltValet to receive status information from your EVSE"
Parameters:
  MyEmail:
    Description: Email for station notifications
    Type: String
    AllowedPattern: '[^@]+@[^@]+\.[^@]+'
  ChargerName:
    Description: Name of your charger
    Type: String
Outputs:
  ConnectURL:
    Description: URL to paste into your code for the AVR-IoT Cellular Mini.
    Value: !Sub "${ApiGatewayRestApi}.execute-api.us-east-2.amazonaws.com"
  TopicARN:
    Description: ARN to paste into your code for the AVR-IoT Cellular Mini.
    Value: !Ref SNSTopic
Resources:
    IAMRole:
        Type: "AWS::IAM::Role"
        Properties:
            Path: "/"
            RoleName: !Sub "${SNSTopic.TopicName}PublishRole"
            AssumeRolePolicyDocument: "{\"Version\":\"2012-10-17\",\"Statement\":[{\"Effect\":\"Allow\",\"Principal\":{\"Service\":[\"apigateway.amazonaws.com\",\"sns.amazonaws.com\"]},\"Action\":\"sts:AssumeRole\"}]}"
            MaxSessionDuration: 3600
            ManagedPolicyArns: 
              - !Ref IAMManagedPolicy
              - "arn:aws:iam::aws:policy/service-role/AmazonSNSRole"
            Description: "Allows SNS to call CloudWatch Logs on your behalf."

    IAMManagedPolicy:
        Type: "AWS::IAM::ManagedPolicy"
        Properties:
            ManagedPolicyName: "VoltValetPublishPolicy"
            Path: "/"
            PolicyDocument: |
                {
                	"Version": "2012-10-17",
                	"Statement": [
                		{
                			"Sid": "VisualEditor0",
                			"Effect": "Allow",
                			"Action": "sns:Publish",
                			"Resource": "*"
                		}
                	]
                }

    SNSTopic:
        Type: "AWS::SNS::Topic"
        Properties:
            DisplayName: !Ref ChargerName
            TopicName: !Ref ChargerName

    SNSTopicPolicy:
        Type: "AWS::SNS::TopicPolicy"
        Properties:
            PolicyDocument: !Sub "{\"Version\":\"2008-10-17\",\"Id\":\"__default_policy_ID\",\"Statement\":[{\"Sid\":\"__default_statement_ID\",\"Effect\":\"Allow\",\"Principal\":{\"AWS\":\"*\"},\"Action\":[\"SNS:GetTopicAttributes\",\"SNS:SetTopicAttributes\",\"SNS:AddPermission\",\"SNS:RemovePermission\",\"SNS:DeleteTopic\",\"SNS:Subscribe\",\"SNS:ListSubscriptionsByTopic\",\"SNS:Publish\"],\"Resource\":\"${SNSTopic}\",\"Condition\":{\"StringEquals\":{\"AWS:SourceOwner\":\"${AWS::AccountId}\"}}}]}"
            Topics: 
              - !Ref SNSTopic

    SNSSubscription:
        Type: "AWS::SNS::Subscription"
        Properties:
            TopicArn: !Ref SNSTopic
            Endpoint: !Ref MyEmail
            Protocol: "email"
            Region: "us-east-2"

    ApiGatewayRestApi:
        Type: "AWS::ApiGateway::RestApi"
        Properties:
            Name: "VoltValet"
            ApiKeySourceType: "HEADER"
            EndpointConfiguration: 
                Types: 
                  - "EDGE"

    ApiGatewayResource:
        Type: "AWS::ApiGateway::Resource"
        Properties:
            RestApiId: !Ref ApiGatewayRestApi
            PathPart: "charger"
            ParentId: !GetAtt ApiGatewayRestApi.RootResourceId

    ApiGatewayMethod:
        Type: "AWS::ApiGateway::Method"
        Properties:
            RestApiId: !Ref ApiGatewayRestApi
            ResourceId: !Ref ApiGatewayResource
            HttpMethod: "POST"
            AuthorizationType: "NONE"
            ApiKeyRequired: false
            RequestParameters: 
                "method.request.querystring.message": true
                "method.request.querystring.topic": true
            RequestModels: 
                "application/json": !Ref ApiGatewayModel
            MethodResponses: 
              - 
                ResponseModels: 
                    "application/json": "Empty"
                StatusCode: "200"
            Integration: 
                CacheNamespace: !Ref ApiGatewayResource
                Credentials: !GetAtt IAMRole.Arn
                IntegrationHttpMethod: "POST"
                IntegrationResponses: 
                  - 
                    ResponseTemplates: {}
                    StatusCode: "200"
                PassthroughBehavior: "WHEN_NO_MATCH"
                RequestParameters: 
                    "integration.request.header.Content-Type": "'application/x-www-form-urlencoded'"
                    "integration.request.querystring.Message": "method.request.querystring.message"
                    "integration.request.querystring.TopicArn": "method.request.querystring.topic"
                RequestTemplates: 
                    "application/json": !Sub |
                        #set($topic="${SNSTopic}")
                        #set($msg=$input.path('$.message'))
                        Action=Publish&TopicArn=$util.urlEncode($topic)&Message=$util.urlEncode($msg)
                TimeoutInMillis: 29000
                Type: "AWS"
                Uri: !Sub "arn:aws:apigateway:${AWS::Region}:sns:path/arn:aws:apigateway:us-east-2:sns:path//*"

    ApiGatewayDeployment:
        Type: "AWS::ApiGateway::Deployment"
        DependsOn: ApiGatewayMethod
        Properties:
            RestApiId: !Ref ApiGatewayRestApi

    ApiGatewayStage:
        Type: "AWS::ApiGateway::Stage"
        Properties:
            StageName: "prod"
            DeploymentId: !Ref ApiGatewayDeployment
            RestApiId: !Ref ApiGatewayRestApi
            CacheClusterEnabled: false
            CacheClusterSize: "0.5"
            TracingEnabled: false

    ApiGatewayModel:
        Type: "AWS::ApiGateway::Model"
        Properties:
            RestApiId: !Ref ApiGatewayRestApi
            Name: "ChargerPublishModel"
            Schema: |
                {
                    "$schema": "http://json-schema.org/draft-04/schema#",
                    "title": "ChargerPublishModel",
                    "type": "object",
                    "properties": {
                        "message": {"type": "string"}
                    }
                }
            ContentType: "application/json"